^^What Hans says. Granted, they'll fit on a W113, but aren't correct for a W113. These were used only on W108, W109, W110, W111 (sedan, coupe`, cabriolet), and W112 (sedan, coupe`, cabriolet).
And what are you referring to when you mention front shock plastic covers? The front shocks didn't have any type of plastic covering on them, either. Are you maybe thinking about the sub frame mount limit stop?